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Can IL300 be a floating voltage source? pls? (Patreon)

Published:
2018-08-16 13:42:38
Imported:
2026-06
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I am putting a lot of trust in these linear 'opto-isolators': https://www.vishay.com/docs/83622/il300.pdf

But I doubt they can replace these voltage sources: http://tinyurl.com/y9pr28t7

It would be too good if they did https://imgur.com/a/1rVQi23

If the open circuit voltage of up to 500 mV could just be added to another signal, like those ideal voltage sources in the simulation labelled sink and source, it would be such an elegant solution.

But for high bandwidth they want to be reverse biased ideally, like the voltage one.

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Comments

Faraz Sadrzadeh

Have you tried any digital solutions for isolation? Delta Sigma, PWM (LTC6692, LTC2645), parallel ADC/DAC. The thingis that digital isolators are plentiful. Analog devices has some Nice magneto resistive isolatora. If you want around 20 Khz bandwidth, PWM is easy and suited. You modulate and demod for signal and do some level shifting for negative signals. Delta sigma is also fast. Precision sigma delta modulators are available and it goes on two lines (CLK and dat) and is then isolated. Its demodulation might be a little harder to come by but definitely possible. The fastest is parallel ADC/ parallel string dac isolation that can give multi megahertz bandwidth.

marcoreps
>>14709999

Yes, that would probably be the most professional approach ... I planned something like that in the last attempt, but sacked it for other reasons. The special appeal of these isolators is that they are completely analog and have no delay ... gotta give em a try before doing the reasonable thing :)

Jamie Magin

I was thinking of using one (or more) PV output optoisolator (plus a very low quiescent current regulator) to replace the old mercury battery when I finish fixing up my old HP null meter. But there I don't care about linearity, just want a quiet bias supply.